Motor-driven brush assembly



June 26, 1951 NQVAK MOTOR-DRIVEN BRUSH ASSEMBLY Filed July 6, 1948INVENTOR. FRANK NOVA l fwd,

ATTORNEYS Patented June 26, 1951 UNITED STATES PATENT OFFICE 1 Claim.(Cl. -,23)

This invention relates to improvements in motor-driven brushes, and moreparticularly to a portable, motor-driven brush for cleaning dairy cattleand for similar purposes.

It is among the objects of the invention to provide an improvedmotor-driven brush which is of small size and light weight so that itcan be conveniently held in the hand for use, which has a handleproviding a comfortable grip, includes means rendering the brushcomponent quickly and readily interchangeable, which requires only asmall amount of power for its operation, and can be plugged intoconveniently located electrical outlets, and which is simple and durablein construction and economical to manufacture.

Other objects and advantages will become apparent from a considerationof theiollowing description and the appended claim in conjunction withthe accompanying drawing, wherein:

Figure 1 is a top plan view of a portable, motordriven brushillustrative of the invention and a fragmentary portion of apower-supplying line for the brush, portions being broken away and shownin cross-section to better illustrate the construction thereof Figure 2is an end elevation of the brush, a portion of the end cover or armbeing broken away and shown in cross-section to better illustrate theconstruction of the brush;

Figure 3 is a transverse cross-section taken substantially on the line33 of Figure 1; and

Figure 4 is a longitudinal cross-section on a somewhat enlarged scaletaken substantially on the line 4-4 of Figure 1.

With continued reference to the drawing, there is illustrated in Figure1 a power line I!) having spaced-apart outlets ll electrically connectedtherein for the reception of a plug, such as the plug I2 connected tothe brush, generally indicated at I3, by the flexible cord [4. Where thebrush is to be used for cleaning cattle in a dairy barn the outlets IIwill be secured to a wall or other supporting structure, preferably onewithin easy reach of each cow stanchion so that it will not be necessaryto provide a long cord M for the brush. The line Ill is connected to apower line by suitable means, such as the plug I5 insertable into aconvenient outlet provided in the building.

The brush l3 comprises a small electric motor having a cylindricalhousing l6 provided in each end with ventilating openings I1 and havinga motor shaft [8 projecting from one end of the housing. Two arms [9 andare secured, one to each end of the motor housing, and extend radiallyoutwardly from the motor housing in the same direction. A handle 2| issecured to the side of the motor housing opposite the side from whichthe arms l9 and 26 extend, and is disposed longitudinally of the motorhousing to provide a comfortable grip for handling the brush.

l. .A belt pulley 22 is secured on the projecting end of the motor shaft[8. A hollow boss 23 is secured to the outer side of arm 19 near theouter end of the arm by suitable means, such as welding or soldering,and a ball bearing 24 is secured in this boss by suitable means, such asthe snap ring 25. A stud 26 is journaled in the bearing and extendsthrough an aperture in the arm [9 and is provided in its inner end witha bore or recess receiving the adjacent end of the cylindrical core 21of the brush component, generally indicated at 28, and with a transversenotch 29 receiving a pin 30 extending transversely through the brushcore to provide a driving connection between the stud and the brush. Abelt pulley 3| is secured on the outer end of stud 26 and a belt 32drivingly connects the belt pulleys 22 and 31. An elongated, cup-shapedcover 33 is secured to arm 13 enclosing the belt pulleys 22 and 3| andthe belt 32. The arm 20 is provided with an outwardly-extending, hollowboss 34 which slidably receives a cup 35 in which is secured a ballbearing 36 similar to the ball bearing 24. A stud 31 is mounted in ballbearing 36 and provided in its inner end with a recess 31 receiving theadjacent end of the brush core 21, movement of the end of the brush coreinto the recess preferably being limited by an abutment washer 38secured on the brush core. A cup-shaped housing 39 is externally screwthreaded onto the boss 34 and encloses the bearing-retaining cup 35 withits'end wall spaced outwardly from the end wall of the bearing-retainingcup. This housing is provided in its outer end with an apertured boss 40and a pin 41 having on its outer end a head 42 extending slidablythrough the boss 40, and is screw threaded at its inner end into anapertured boss 43 provided on the end wall of the bearing-retaining cup35. A compression spring 44 is disposed in the housing 39 and operativebetween the bearing-retaining cup 35 and the end wall of the housing 39to resiliently urge the bearing inwardly so that the recess 31 in stud31 receives the adjacent end of the brush core.

When it is desired to release the brush from the arms, the head 42 ofpin 4| is pulled outwardly, thereby removing stud 31 from the adjacentend of the brush core, whereupon the brush compo- 3 nent 28 may beremoved and another component substituted therefor.

A transversely-curved guard plat 45 is secured to'the motor housing 16adjacent the brush 28 with its concave surface facing the brush andspaced therefrom. The sides of the guard plate may be extended aroundthe brush, as may be found convenient or necessary, so that the brushwill not throw any material removed thereby toward the operator of thebrush.

The invention may be embodied in other specific forms without departingfrom the spirit or essential characteristics thereof. The presentembodiment is, therefore, to be considered in all respects asillustrative and not restrictive, the scope of the invention beingindicated by the-appended claim rather than by the foregoingdescription,and all changes which come within the meaning and range of equivalencyof the claim are,'therefore, intended to be embraced therein.

What is claimed is: In a portable brush assembly including an elongatedmotor housing having opposite ends, arms secured to said motor housingat the respectively opposite ends of the latter and pro-.

therein, an anti-friction bearing secured in one.

of said bosses, a stud secured in said bearing and projecting throughthe aperture in the corresponding arm, said stud having a recessed andtransversely notched end receiving the adjacent end of the brush core, apin extending through said core and received in said notch, a beltpulley on said stud at the opposite end thereof, a cup slidable in theother of said bosses and having an open end adjacent the associated armand an end wall at its other end, a housing secured to said other bossand enclosing said cup and having an end wall spaced from the end wallof said cup, an anti-friction bearing secured in said cup, a studsecured in said last mentioned bearing and projecting through theaperture in the associated arm, the last mentioned stud having'arecessed end receiving the adjacent end of the brush core, a compressionspring disposed in said housing between the end wall of said cup and theend wall of said cup housing to resiliently maintain the brush coreseated in said last mentioned stud, said cup housing having an aperturein its end wall, a pin secured at one end'to said cup and extendingthrough the aperture in the housing end wall, and a head on said pin atthe outer side of said cup housing for moving said cup against,

the force of said spring to release the brush core from said lastmentioned stud.

FRANK NOVAK.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,576,196 Kemmis Mar. 9, 19261,593,803 McDonald July 27, 1926 1,816,054 Pelkey July 28, 19311,991,794 Cutright Feb; 19, 1935 2,038,648 De Lange Apr. 28, 1936

